manville



2 Sheets-Sheet 1.

(No Model.)

E. J. MANVILLE.

MACHINE FOR TAPPING GAS AND WATER FITTINGS.

Patented Nov. 18, 1884.

N. PETERS. PlvuKn-Lvlhugmpllen wasmn lm D. c.

(No Model.) 2 Sheets Sheet 2.

E. J. MANVILLE. y

MACHINE FOR TAPPING GAS AND WATER FITTINGS. No. 308,182. 8 Patented Nov.18, 1884.

N. PETERS PholwLilhugmpher. Wash-" m", D. c.

PATENT :FFICF.

- ELI J. MANVILLE, OF WATERBURY, CONNECTICUT.

MACHINE FOR TAPPI NG GAS AND WATER FITTINGS.

SPECIFICATION forming part of Letters Patent No. 808,182, dated November18, 1884.

Application filed December 31, 1883. (No model.)

T 0 all whom it may concern.-

Be it known that I, ELI J. MANVILLE, of Waterbury, in the county of NewHaven and State of Connecticut, have invented a new Improvement in Tapsfor Steam and Gas Fittings; and I do hereby declare the following, whentaken in connection with accompanying drawings and the letters ofreference marked thereon, to be a full, clear, and exact description ofthe same, and which said drawings constitute part of this specification,and represent, in

Figure 1, a top or plan vieW;'Fi g. 2, a transverse section on line orso, looking forward Fig. 3, a side view of the mandrel and the tapmechanism; Fig. 4, a side view showing a portion of the sleeveL cut awayFig. 5, a longitudinal central section; Fig. 6, afront end view with thecovering-plate removed, showing the dies in their thrown-out orprojecting position; Fig. 7, the same figure, showing the dies in theirdrawn or contracted position; Fig. 8, a section on line 3/ y of Fig.5,looking rearward, and showing the parts as when the dies are thrownout into active position; Fig. 9, the same section, showing the diesdrawn inward or into the contracted position; Fig. 10, a transversesection on line a ,2, Figs. 3 to 10, inclusive, enlarged.

This invention relates to an improvement in machines for tapping gas andwater fittings, with special reference to the revolving. tap which isadvanced toward the thing to be tapped and withdrawn after the thread iscut, the object being the construction of a tap in which thecutting-dies shall be readily movable, and so that such movable diesshall be automatically thrown outward and held as the tap approaches thething to be tapped, and after the thread has been cut the said dies willbe automatically drawn inward to permit the die to be removed withoutreversing its rotation; and the invention consists, principally, inscrewcutting dies arranged radially in a revolving head combined with acam centrally between said dies, to which cam partial rotation isimparted before the screw-cutting dies commence their operation, andsuch rotation of the cam operating to force the dies radially outwardinto working position, and to hold-them in that position until thescrew-cutting is accom plished, and then a rotation imparted to the camin the opposite direction will release the the tap. The tap consists ofa mandrel, E,

dies and permit them to recede radially away from the thread which theyhave cut, and so that the tap may be withdrawn without reversing thisrevolution, as more fully hereinafter described.

In illustrating the machine I show only that part which carries the tap.The devices for holding the article to be tapped being immaterial tothis invention, I have not included them in the drawings.

A represents the bed of the machine, on which, in suitable bearings, BB, an arbor, C, is arranged, free to rotate in the bearings, and alsofree for axial or longitudinal movement. Between the bearings, and onthe arbor, a pulley, D, is arranged in engagement with the arbor, so asto impart rotation to it, but held to prevent its longitudinal movement,the connection between the arbor and pulley being the usualspline-and-groove arrangement, too well known to require particulardescription in this specification. Longitudinal movement is imparted tothe arbor by connection with an annular groove, a, at its rear end, orotherwise, also a well known device, and not necessary to be describedin this specification, as my invention relates only to which isintroduced into the forward end of the arbor C in the usual manner ofintroducing other tools into such a revolving arbor. Concentricallywithin the mandrel, and entering from its forward end, is a spindle, F,carrying at its'forward end cams b, corresponding to the number ofthreading-dies. Between the faces of the cams b a'recess, d, is formed.At the outer end of the mandrel is a head, G, in which are radialrecesses to receive the threadcutting dies 9. These dies are arrangedradially in the recesses, as seen in Fig. 6, and so that when the facesof the cams I) stand in line with the dies, as seen in Fig. 6, the diesare forced outward to their working position, but when the cam is turnedto the intermediate position, as seen in Fig. 7, to bring the recessescl into line with the dies then the dies 5 will move radially inwardinto such recesses, the depth of the recesses being greater'than thedepth of the thread which the dies are to cut. Around the mandrel, andin rear of the dies, is a sleeve, H. From this sleeve a stud or pin, e,passes through a short annular slot, f,'into the spindle F, which makesa firm connection between the spindle and the sleeve, and so that boththe spindle and sleeve may have a rotation independent of the mandrel,or vice versa, to the extent of the slot f, the pin in the slotpreventing longitudinal movement of the sleeve; hence by turning thesleeve independent of the mandrel the spindle will be turned with it,say as from the position seen in Fig. 6 to that in Fig. 7, or viceversa.

To force the dies inward as the cam is turned, a projection, i, is madeon the rear edge of each of the dies, to extend beneath the sleeve H.The inner surface of the sleeve over these projections is madecam-shaped, the reverse of the spindle, as seen in Figs. 8 and 9, and sothat when the dies are out, as seen in Fig. 6, the projections 1' standin a corresponding recess, Z, in the sleeve, but when the sleeve andspindle are turned to take the cams b from beneath the-dies, as seen inFig. 7, then the inward projections or cam-surfaces m on the sleeve bearupon the projections i of the dies and force them inward, as seen inFig. 9.

In rear of the sleeve H is another sleeve, I, and over this sleeve is asecond sleeve, L. Through the two sleeves a screw, M, passes into alongitudinal slot, N, in the mandrel, as seen in Fig. 4, which engagesthe sleeve with the mandrel, so that the sleeve will revolve with it,but yet permit a certain amount of longitudinal movement to the sleeveindependent of the mandrel.

In the sleeve I is a slot, n, standing at an angle of about forty-fivedegrees. From the spindle F a stud, 0*, extends outward through a shortannular slot, 8, in the mandrel into the diagonal slot at in the sleeveI, and so that if a partial rotation be given to the spindle independentof the mandrel, or vice versa, it will, because of the inclination ofthe slot n in the sleeve I, impart a corresponding longitudinal movementto said sleeve I, as indicated in broken lines, Fig. 4.

On the rear end of the sleeve H is a shoulder, t. On the frame or bed ofthe machine is a hinged dog, a, which rides upon the surface of thesleeve H. (See Figs. 1 and 2.) Supposing the rotation of the mandrel andscrewcutting dies to commence in the position seen in Fig. 1, where theparts are shown in their extreme rear position, the dies advance and,entering the hole to be threaded, engage therewith, and from the time ofsuch engagement the dies advance according to the pitch of the threadand take with them the mandrel and sleeves thereon, and continue toadvance until the dog a will fall from the surface of the sleeve H, asseen in broken lines, Fig. 2, and into the path of the shoulder it. Thatshoulder coming in contact with the nose of the dog will cause thesleeve H to stop, and with it the spindle F; but the dies y willcontinue their rotation, because of their connection with the mandrel E.This movement will take the dies from the position in Fig. 6 to theposition in Fig. 7 with relation to the cams, in

which movement the dies are drawn inward and out of engagement with thethread they are cutting. During the time in which the sleeve is standingand the mandrel rotating, a cam, 20, on the surface of the mandrel, inrear of the shoulder t, passes beneath the dog and raises the dog out ofengagement with the shoulder t, as seen in broken lines, Fig. 2, and sothat from the time of such disengagement of the dog the sleeve H and thepart connected with it are free to revolve with the mandrel. During thetime the spindle F is standing as before described the stud r thereonoperates in connection with the diagonal slot n in the sleeve I, and sothat the sleeve I, revolving with the mandrel, will, because of theinclination of the slot 12., be forced to the rear, as indicated inbroken lines, Fig. 4. In this condition, the dies having completed theirwork, the arbor C is permitted to return, taking with it the mandrel Eand all in connection therewith. In such rear movement an annularflange, I, on the sleeve L strikes a stationary finger, T, before therear movement is completed. The rear movement of the mandrel continuingwhile the sleeve Iis thus held by the stop or finger T causes the stud rto move rearward through the diagonal slot n, which movement, because ofthe inclination of the slot at, will impart a corresponding rotation tothe spindle, and which rotation of the spindle will by means of the studebe imparted to the sleeve H to return it-that is, to the position seenin Fig. 8leaving the dies free, and during this movement the rotation ofthe spindle will cause the cams b to force the dies outward and into theworking position before described and as seen in Fig. 6, in whichposition they are ready for action, as before. Thus it will be seen thatthe mandrel revolves continually in one direction, and that the dies actto out the thread, and so soon as the cutting is completed they areautomatically drawn inward, because of the continued rotation of themandrel, and when so drawn inward are permitted to retreat from the holewhich they have tapped, and after such retreat are automaticallyreturned into the cutting position by the same continued rotation of themandrel, and thus I avoid the necessity of any reverse gear to withdrawthe dies, and the consequent loss of time.

The sleeve L is applied as a cover for the slot at in the sleeve I; butthey are to be considered practically as a single sleeve.

While I prefer the dog a to arrest the rotation of the spindles, it willbe readily seen that I do not wish to be understood as limiting myselfto this particular device, and while I prefer the connection between thetwo sleeves H and I, whereby the cams will be returned through theinstrumentality of the said sleeve I, I do not wish to be limited tothis particular device for returning the cams.

' I claim- 1. The combination of a continuously-re volving mandrel, E,the radially-moving dies g, the spindle F longitudinally within saidmandrel, provided with cams b and intermediate recesses, d, the sleeve Houtside said mandrel, and in connection with the spindle within themandrel, with astop, substantially such as described, to arrest therotation of the sleeve and spindle at a predetermined time, whereby thecams on said spindle will be thrown from their position supporting thedies and permit the inward movement of the dies, substantially asdescribed.

2. The combination of the revolving mandrel E, the radial dies 9,arranged thereon, the spindle F within said mandrel, carrying cams b,with intermediate recesses, (Z, the sleeve H on said mandrel,constructed with a'shoulder, t, cam w on the mandrel, and the dog a,substantially as described.

3. The combination of the revolving mandrel E, the radial dies 9thereon,said dies constructed with projections i, the spindle F in saidmandrel, provided with the cams b, and intermediate recesses, cl, thesleeve H on said mandrel, and in connection with said spindle through anannular slot in said mandrel, the said sleeve constructed with camsmandintermediate recesses, Z, upon its inner face and with said spindlethrough an annular slot in the mandrel, the mechanism, substantiallysuch as described, to arrest the rotation of the sleeve at apredeterminedtime, the sleeveIon said mandrel in rear of the sleeve Hthe said sleeve I engaged with the mandrel so as to ride thereon, butfree for longitudinal movement independent of said mandrel, said sleeveI constructed with a diagonal slot, 42, into which a stud from thespindle F extends through an annular slot in the mandrel, substantiallyas and for the purpose described.

E. J. MANVILLE.

\Vitnesses:

S. W. KELLOGG, M. H. BRENNAN.

